A useful code profiling tool is the dprofpp tool which gives detailed information on the various functions and their relative performance. The tool needs to be provided the input of a code profile file. This file can be generated by the Devel::DProf module in conjunction with the perl debugger. The Devel::DProf can be downloaded from CPAN using the command
perl -MCPAN -e 'install Devel::DProf'
After installing the module, you can profile the execution of flowscan by running the perl debugger as:
perl -d:DProf flowscan
This generates a tmon.out file which contains the code profiling information. Once the execution is complete you can examine a summary of the performance of the subroutines and overall code by:
dprofpp -F tmon.out
In my case this produced the following output for the execution of flowscan. Meanings of various columns are given at dprofpp:
| Code Block |
|---|
akbar@iepm-resp $ dprofpp -F tmon.out Faking 6 exit timestamp(s). Total Elapsed Time = -2.14996 Seconds User+System Time = 0 Seconds Exclusive Times %Time ExclSec CumulS #Calls sec/call Csec/c Name 0.00 3.050 3.034 10560 0.0003 0.0003 HTML::Table::getTable 0.00 2.990 2.956 22906 0.0001 0.0001 RRDs::update 0.00 1.730 1.730 18 0.0961 0.0961 JKFlow::pushApplications 0.00 1.523 6.549 1761 0.0009 0.0037 JKFlow::scoreboard 0.00 1.000 5.145 22906 0.0000 0.0002 JKFlow::reporttorrd 0.00 0.780 1.178 61390 0.0000 0.0000 JKFlow::countDirections 0.00 0.750 0.749 468 0.0016 0.0016 RRDs::create 0.00 0.720 0.716 32383 0.0000 0.0000 JKFlow::scale 0.00 0.620 1.826 61390 0.0000 0.0000 main::wanted 0.00 0.570 3.458 22906 0.0000 0.0002 JKFlow::updateRRD 0.00 0.568 12.226 881 0.0006 0.0139 JKFlow::reporttorrdfiles 0.00 0.540 0.356 122780 0.0000 0.0000 Net::Patricia::match_integer 0.00 0.460 0.436 15958 0.0000 0.0000 HTML::Table::addRow 0.00 0.460 1.454 61390 0.0000 0.0000 JKFlow::wanted 0.00 0.345 2.142 49 0.0070 0.0437 Cflow::find |